J/AJ/150/67 Optical photometry for 1ES 1959+650 (Yuan+, 2015)
Optical photometry of the BL Lac object 1ES 1959+650.
Yuan Y.H., Fan J.H., Pan H.J.
<Astron. J., 150, 67 (2015)>
=2015AJ....150...67Y 2015AJ....150...67Y
ADC_Keywords: Galaxies, photometry ; QSOs ; BL Lac objects ; Photometry, VRI
Keywords: galaxies: photometry - quasars: individual: 1ES 1959+650
Abstract:
Using the 1.56m telescope at Shanghai Observatory, China, we present
the photometric results of 1ES 1959+650, which cover from 2006 June 11
to 2014 July 31. The maximum variabilities are
ΔmV|max=1.74±0.02mag in the V band,
ΔmR|max=0.97±0.02mag in the R band, and
ΔmI/max=1.15±0.03mag in the I band. During the monitoring
period, we obtain intraday variabilities on 2009 September 2
(JD2455077) and 2009 September 3 (JD2455078). On 2009 September 2, the
intraday variabilities are ΔmV=0.36±0.08mag within 1.56hr,
ΔmR=0.21±0.04mag within 23minutes, and
ΔmI=0.53±0.03mag within 45minutes. On 2009 September 3, the
intraday variabilities are ΔmV=0.40±0.10mag within
27minutes, ΔmR=0.48±0.04mag within 3.24hr, and
ΔmI=0.68±0.06mag within 3.72hr. The two intraday
variabilities occur in 24hr, which may occur in the same variable
phase. Other results show that (1) no quasi-periodicity is found in
the long-term light curve and (2) the correlations between the
brightness and the spectrum show obvious anti-correlation,
α=-(0.18±0.02)FV+(2.33±0.12), with the correlation
coefficient r=-0.74 and the chance probability p<0.01%.
Description:
The observations were carried out with the Sheshan 1.56m optical
telescope at Shanghai Astronomical Observatory, and the telescope is
equipped with a cooled CCD camera (1024*1024 pixels, 1pixel=0.019mm).
The view field of the telescope is about 4'17'' (1pixel=0.25'') and
probably 13' (1pixel=0.25'') for the local reducer. Another new
liquid-nitrogen-cooled CCD camera (2048*2048pixels) has been used
since 2002 August. The chip subtends 11'*11' in the sky and the
scale is 0.31arcsec per pixel (1pixel=0.024mm). The filters are
standard Johnson B, V and Cousins R, I.
For 1ES 1959+650, the VRI monitoring was over the period from 2006
June 11 to 2014 July 31.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
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19 59 59.85 +65 08 54.7 1ES 1959+650 = QSO B1959+650
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 21 436 The VRI observations of 1ES 1959+650
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See also:
J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
J/ApJS/185/511 : Optical microwariability of S5 0716+714 (Poon+, 2009)
J/MNRAS/392/1181 : BV(RI)c photometry of 3C 273 (Dai+, 2009)
J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
J/A+A/406/L9 : TeV Gamma-Rays from 1ES 1959+650 (Aharonian+, 2003)
J/A+AS/144/481 : BVRI photometry of 5 X-ray selected BL Lacs (Villata+, 2000)
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 A1 --- Band [VRI] Filter (Johnson V, Cousins R, or Cousins I)
3- 10 F8.3 d JD Julian Date (JD-2453000)
12- 16 F5.2 mag mag [13.16/15.93] The V-band magnitude (1)
18- 21 F4.2 mag e_mag [0.01/0.38] The 1σ uncertainty in Vmag
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Note (1):
* In the V band, there are 120 observations, ranging from 14.19±0.01mag
to 15.93±0.01mag with an average value of <Vmag> = 14.86±0.36mag.
* In the R band, there are 153 observations, ranging from 13.86±0.02mag
to 14.83±0.01mag with an average value of <Rmag> = 14.35±0.24mag.
* In the I band, there are 163 observations, ranging from 13.16±0.02mag
to 14.31±0.02mag with an average value of <Imag> = 13.81±0.23mag.
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History:
From electronic version of the journal
(End) Sylvain Guehenneux [CDS] 09-Oct-2015